Seven Worlds Re:Emerge

I have lived through countless fights, died countless times and resurrected plenty after to get to the peak and beyond. Now after my 999,999th life I will be reincarnated into my last and first life with no strings attached. But when I was reincarnated six other souls fused into mines and became a new soul. Those souls which I thought was going to cause negative affect to my soul turned out to be my souls. To be more precise, my soul was split into seven and I have reached the peak and beyond in six other worlds respectively. Which means I have experience 7 times the experience I thought at first. And now after coming back to live my life from the beginning with my complete soul was both relieving and difficult. Since my soul had 7 times the knowledge, experience, etc. it took years before I could get use to it. But one thing about it is my soul is extremely strong and the downfall to that is my current body can't contain my soul so I have a multi-layer seal place on my soul. And in this world I thought was ordinary, was far from it as seen by my parents and the world. In this world people awaken to systems around the age of 13 but systems are not the only weird thing oh no it's not. Now the worlds that my split souls reached the heights power in were now accessible to each other and this one. So yes Cultivators, Swords and Magic, Hunters and Dungeons, and Genetic Enhancers that gain powers are a thing, now that we are connected to cultivators worlds, fantasy world, hunters world and a post-apocalyptic world. And me who been through them without any cheats will have to live in this new age time without a system that's normal to have Or will I? And what's this about a 7th world that appeared long ago? Why was my soul split? But why is one part of my soul locked even after the reemergence?